diff options
Diffstat (limited to 'lib/pure/subexes.nim')
| -rw-r--r-- | lib/pure/subexes.nim | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/lib/pure/subexes.nim b/lib/pure/subexes.nim index 7ab5d1ad3..3e5e36b38 100644 --- a/lib/pure/subexes.nim +++ b/lib/pure/subexes.nim @@ -297,7 +297,7 @@ proc subex*(s: string): TSubex = ## no syntax checking but this may change in later versions. result = TSubex(s) -proc addf*(s: var string, formatstr: TSubex, a: openarray[string]) {. +proc addf*(s: var string, formatstr: TSubex, a: varargs[string, `$`]) {. noSideEffect, rtl, extern: "nfrmtAddf".} = ## The same as ``add(s, formatstr % a)``, but more efficient. var p: TFormatParser @@ -326,6 +326,15 @@ proc `%` *(formatstr: TSubex, a: string): string {.noSideEffect, result = newStringOfCap(formatstr.string.len + a.len) addf(result, formatstr, [a]) +proc format*(formatstr: TSubex, a: varargs[string, `$`]): string {.noSideEffect, + rtl, extern: "nfrmtFormatVarargs".} = + ## The `substitution`:idx: operator performs string substitutions in + ## `formatstr` and returns a modified `formatstr`. This is often called + ## `string interpolation`:idx:. + ## + result = newStringOfCap(formatstr.string.len + a.len shl 4) + addf(result, formatstr, a) + {.pop.} when isMainModule: |